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Impedance formulas of RF patch resonators and antennas of cavity model using fringe extensions of patches from DC capacitors
Author(s) -
Sun Y. X.,
Chow Y. L.,
Fang D. G.
Publication year - 2002
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.10587
Subject(s) - resonator , capacitor , microwave , substrate (aquarium) , antenna (radio) , electrical impedance , permittivity , electrical engineering , physics , field (mathematics) , materials science , optoelectronics , engineering , optics , topology (electrical circuits) , mathematics , dielectric , voltage , telecommunications , oceanography , geology , pure mathematics
Fringe field effect is equivalent to an extension in size of an RF patch, either as resonator or as antenna. A CAD formula for this extension is derived from DC capacitor and is shown to be applicable for all practical thickness and permittivity ε r of the substrate. For example, for patch resonators of large ε r and for patch antennas on thick substrate (h/λ 0 < 0.23), the maximum errors in resonant frequencies are only 0.2% and 3%, respectively. The fringe extension through DC is understandable in physics from the point of view of the frequency invariance of fringe field with thin substrate asymptotically. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 293–297, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10587